docs: async def get_decryption_aes_key(self, key: bytes, material_description: Dict[str, Any]) -> bytes:
          """
          Get decryption key for a given S3 object
  
          :param key: Base64 decoded version of x-amz-key-v2
          :param material_description: JSON decoded x-amz-matdesc
          :return: Raw AES key bytes
          """
          raise NotImplementedError()